Conductimetric and spectrophotometric determination of the volatile acidity of wines by flow injection

R�vio Guimar�es Barros, Matthieu Tubino
1992 The Analyst  
Usual methods for the determination of the volatile acidity of wines are relatively slow, as about 40 min are necessary t o perform one analysis. In this work, a method was developed which provides results in a much shorter time. About 60 analyses can be performed in 1 h. The conductimetric analysis consists of the injection of the wine sample into a de-ionized water stream which then flows past a poly(tetrafluoroethy1ene) membrane separator. The acetic acid diffuses through the membrane into
more » ... the membrane into another water stream that passes through a conductivity cell. The spectrophotometric method is similar. The acetic acid diffuses into a stream of Bromocresol Purple solution, at pH 7.0, which passes through a flow cell in a spectrophotometer set at 540 nm. For comparison, analyses were also carried out by the method of Jaulmes.
doi:10.1039/an9921700917 fatcat:zs5i5hgf3vftfm5tv7rfe2v44u